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3 years ago

K2SO4 H3PO4 and NaOH KOH and H2SO4 HPO4 and KOH

Chemistry

2 answers:

Andrej [43]3 years ago

7 0

Answer: b

Explanation:

mylen [45]3 years ago

3 0

Answer: B and the answer for the second question is A

Explanation:

I just took the assignment hope this helps:)

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A liquid occupies a volume of 5.0 L has a mass of 6.0 kg. what is the density of a the lights in kg/L

grandymaker [24]

Answer:

Hey there! :

Volume = 5.0 L

mass = 6.0 Kg

Therefore:

Density = mass / Volume

Density = 6.0 / 5.0

Density = 1.2 kg/L

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3 years ago

What is the half-life of a pharmaceutical if the initial dose is 500 mg and only 31 mg remains after 6 hours?

Sergeu [11.5K]

Answer:

$\large \boxed{\text{b. 1.5 h}}$

Explanation:

1. Calculate the rate constant

The integrated rate law for first order decay is

$\ln \left (\dfrac{A_{0}}{A_{t}}\right ) = kt$

where

A₀ and A_t are the amounts at t = 0 and t

k is the rate constant

$\begin{array}{rcl}\ln \left (\dfrac{500}{31}\right) & = & k \times 6\\\\\ln 16.1 & = & 6k\\2.78& =& 6k\\k & = & \dfrac{2.78}{6}\\\\& = & 0.463 \text{ h}^{-1}\\\end{array}$

2. Calculate the half-life

$t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{\text{0.463 h}^{-1}} = \textbf{1.5 h}\\\\ \text{The half-life is $\large \boxed{\textbf{1.5 h}}$}$

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3 years ago

During transcription, RNA polymerase encounters the sequence of DNA

SVEN [57.7K]

Answer:

it 123456789 •-• ™ I h--e yu hehehe

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2 years ago

Read 2 more answers

Why are bubbles and precipitates both signs of chemical change

BartSMP [9]

Answer:(I didn’t really know where to Wrigh-)

Explanation: Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas. The chemical change that creates the gas is completed after the gas bubbles leave the mixture.

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2 years ago

Running water can transport weathered pieces of rocks downstream what will happen to these weathered pieces of rocks and sedimen

OleMash [197]

Answer:

those small sediments begin to precipitate, condense on the ground and finally settle.

Explanation:

Sedimentation is a natural process, which occurs spontaneously in nature and promotes the formation of sedimentary rocks.

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